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Anyone know what the values of R31 & R32 are on the Marshall ST1 PCB? I've got a 1987 MKII here and they're pretty crispy and can't tell what they are. Thanks!!
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Anyone? Well they look like they're 10ohms: they appear to be brown,black,black but that doesn't match anything on the schematic. Here's a link to the schemo:
http://www.schematicheaven.com/marsh...d_50w_1987.pdf -
Or is it this one: http://www.drtube.com/schematics/marshall/1987mk2u.gif ?
Which valves you have? EL34 or 6550?
You can also take a look here: MetroAmp.com Forum • View topic - THE OFFICIAL Marshall "Lead & Bass" thread
and here: http://marstran.com/1964.gif
MarkComment
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They are EL34'sComment
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I had already taken a look at that particular post on the metro amp forum. I tried jumping in those 10ohm resistors & it was working fine for a bit but then the HT fuse popped. Now it pops even without the tubes in. So I'm guessing they're not supposed to be 10ohms. Doh!!Comment
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It's part of the heater circuit- pin 2 on one of the El34's was pretty charred up. It's connected directly to R32.Comment
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I suspect that these are two 100R resistors that provide a reference to the ground of heaters. Like here: http://www.drtube.com/schematics/marshall/9001-2.gif
MarkComment
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